What is the use of cursor ? how cursor allocate context area for executing the sql statement?
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Answer Posted / kamal
Cursor is a named private SQL area from where information
can be accessed. Cursors are required to process rows
individually for queries returning multiple rows.
Within the library cache, parsed SQL is stored as cursors.
The cursors are indexed by handlers referencing memory
locations within which parsed statements and information
relating to processing are stored. A context area is a
shared area of memory that stores the environment and
session variables for an instruction. Buffer caches store
active data and use a cache replacement scheme storing the
most recently used data.
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